Off-shell Higgs boson measurements: Yukawa couplings, self-coupling, compositeness, and width
Abstract
Measurements of Higgs boson production in the off-shell region are presented, using the four-lepton decay channel. Data from proton-proton collisions at the CERN LHC, collected by the CMS experiment and corresponding to an integrated luminosity of 138 fb−1 at a center-of-mass energy of 13 TeV, are utilized. The first direct test of composite Higgs boson models is performed, with a lower limit on the compositeness scale ΛH set at 870 GeV at the 95% confidence level. Tests of gluon-fusion production within the standard model effective field theory framework are performed. The first constraint on the Higgs boson self-coupling in the off-shell region is obtained. By combining on- and off-shell measurements, the analysis sets the tightest constraints to date on light-quark Yukawa couplings, while relaxing assumptions such as the bound on the Higgs boson coupling to vector bosons, thereby providing more model-independent results. Constraints on the Higgs boson width are provided while accounting for a range of beyond-the-standard-model effects, including both light and heavy particles in the gluon-fusion production loop, as well as modified couplings to vector bosons. A combined analysis of the H→ZZ and PH→WW channels is performed to improve sensitivity to the Higgs boson width, yielding ΓH = 5.1+2.0−1.8 MeV. The scenario of no off-shell Higgs boson production is excluded at a confidence level exceeding 5 standard deviations.
Related
- The 248 keV LZ Recoil: A Possible Hint of Non-SM-Like Quark Yukawa Couplings with a Scalar-Portal Dark Matter
- Multi-Higgs production from a theory of varying Higgs quartic and top Yukawa couplings
- Yukawa coupling deviations from four-quark interactions
- Analysis of the C P structure of the Yukawa coupling between the Higgs boson and tau leptons in proton-proton collisions at √s = 13.6 TeV
- Analysis of the CP structure of the Yukawa coupling between the Higgs boson and tau leptons in proton-proton collisions at √s=13.6 TeV
BibTeX
@misc{collaboration2026offshell,
title = {{Off-shell Higgs boson measurements: Yukawa couplings, self-coupling, compositeness, and width}},
author = {CMS Collaboration},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2607.23352},
eprint = {2607.23352},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.23352},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Off-shell Higgs boson measurements: Yukawa couplings, self-coupling, compositeness, and width
AU - CMS Collaboration
PY - 2026
DA - 2026/10/05
PB - arXiv
DO - 10.48550/arxiv.2607.23352
UR - https://arxiv.org/abs/2607.23352
AB - Measurements of Higgs boson production in the off-shell region are presented, using the four-lepton decay channel. Data from proton-proton collisions at the CERN LHC, collected by the CMS experiment and corresponding to an integrated luminosity of 138 fb^−1 at a center-of-mass energy of 13 TeV, are utilized. The first direct test of composite Higgs boson models is performed, with a lower limit on the compositeness scale Λ_H set at 870 GeV at the 95% confidence level. Tests of gluon-fusion production within the standard model effective field theory framework are performed. The first constraint on the Higgs boson self-coupling in the off-shell region is obtained. By combining on- and off-shell measurements, the analysis sets the tightest constraints to date on light-quark Yukawa couplings, while relaxing assumptions such as the bound on the Higgs boson coupling to vector bosons, thereby providing more model-independent results. Constraints on the Higgs boson width are provided while accounting for a range of beyond-the-standard-model effects, including both light and heavy particles in the gluon-fusion production loop, as well as modified couplings to vector bosons. A combined analysis of the H→ZZ and PH→WW channels is performed to improve sensitivity to the Higgs boson width, yielding Γ_H = 5.1^+2.0_−1.8 MeV. The scenario of no off-shell Higgs boson production is excluded at a confidence level exceeding 5 standard deviations.
ER -